JP7073185B2 - Structure of work space for wall balustrade buried pipeline, construction method and formwork used for construction - Google Patents

Description

The present invention is to bury a wall balustrade for working on a cable laid using a pipeline for communication and electrical equipment (hereinafter referred to as a wall balustrade buried pipeline) formed in the wall balustrade of a bridge. It relates to the structure, construction method and formwork used for construction of the work space for pipelines.

When cables for communication and electrical equipment are laid using pipelines formed in the ground, work on cables such as branching of the cables and inspection of cables is provided in the middle of the pipeline. It is done using a work space called a hand hole or a manhole. Various proposals have been made regarding the structure and construction method of this workspace.

For example, Japanese Patent Application Laid-Open No. 2007-28843 proposes a concrete underground wiring box that can be prefabricated in a factory and can change the laying route at a flexible angle.

Further, in Japanese Patent Application Laid-Open No. 2014-200961, the manhole wall in the expansion direction is demolished inside the manhole, the inside of the manhole is excavated while propelling the steel box by a propulsion device, and the excavated hole is reinforced and a formwork is provided. A manhole expansion method has been proposed in which concrete is supplied and hardened in this formwork to expand the existing space.

JP-A-2007-28843 JP 2014-200961

However, when a work space is provided in the wall balustrade for working on cables laid using the wall balustrade buried pipeline, the wall balustrade has a sufficient guard rail function even if the work space is provided. Must be maintained. On the other hand, when a work space is provided in the middle of a pipeline formed in the ground, it is usually not necessary to consider the strength of the soil in which the work space is formed. Therefore, in the conventional technique of providing a work space in the middle of a pipeline formed in the ground, it is difficult to provide a work space in the middle of the wall balustrade buried pipeline without impairing the guard rail function of the wall balustrade.

Therefore, the present invention is used for the structure, construction method and construction of a work space for a wall balustrade buried pipeline, in which a work space can be provided in the middle of the wall balustrade buried pipeline without impairing the guard rail function of the wall balustrade. The purpose is to provide a formwork.

The structure of the work space for the wall balustrade buried pipeline according to the present invention communicates with the wall balustrade buried pipeline extending in the length direction of the wall balustrade in the wall balustrade of the bridge, and the road side surface of the wall balustrade. Has a square opening that opens in. The back surface facing the opening stands upright in the vertical direction, and the height dimension of the opening and the depth dimension from the opening to the back surface are larger than the diameter of the wall balustrade buried pipeline, and the opening portion. The bottom surface forming the lower edge in the height direction and the back surface are connected by a connecting surface that intersects both the bottom surface and the back surface at an blunt angle and is inclined with respect to the horizontal direction. Then, the back surface and the connecting surface are arranged so as to be inclined along the shape of the ground covering portion in the wall balustrade, and are arranged on the road side with respect to the reinforcing bars forming the reinforcing bars of the wall balustrade.

In the structure of the work space for a wall formwork buried pipeline according to the present invention, the bottom surface, the two side surfaces standing up against the bottom surface and forming the edge of the opening, and the edge of the opening parallel to the bottom surface are formed. Reinforcing bars extending upward and downward from the wall balustrade and embedded in the wall balustrade may be arranged from the formwork members constituting the ceiling surface.

In the method for constructing a work space for a wall balustrade buried pipeline according to the present invention, a wall plate having a square opening and one of the wall plates forming the edge of the opening is set as the bottom, and the back wall portion facing the opening is used. And the bottom portion are connected by a connection wall portion that intersects both the back surface wall portion and the bottom portion at an obtuse angle, a plurality of through holes are provided in the bottom portion, and the bottom portion stands up against the wall plate forming the bottom portion. Both of the wall plates forming the edge of the opening are side walls, and the formwork having through holes formed in both of the side walls is inclined with respect to the horizontal direction with the bottom as the lower side. Arranged in the orientation. Then, a wall balustrade buried pipeline extending in the length direction of the wall balustrade is connected to the through hole of the side wall portion in the wall balustrade of the bridge, and the back wall portion and the connecting wall portion are connected to the connecting wall portion. Concrete is placed on the back surface of the formwork so as to be inclined along the shape of the ground covering portion in the wall balustrade and arranged on the road side with respect to the reinforcing bars forming the reinforcement of the wall balustrade.

In the method for constructing a work space for a wall balustrade buried pipeline according to the present invention, the formwork is provided with a ceiling portion facing the bottom portion and parallel to the bottom portion and a reinforcing bar extending outward on the bottom portion. The reinforcing bar may be embedded in the wall column.

The bottom portion and the side wall portion, and the ceiling portion facing the bottom portion and parallel to the bottom portion and the side wall portion may be connected via a curved surface.

The formwork used for constructing the work space for the wall balustrade buried pipeline according to the present invention has a square opening, and one of the wall plates forming the edge of the opening is a bottom and faces the opening. The back wall portion and the bottom portion are connected by a connection wall portion that intersects both the back surface wall portion and the bottom portion at an obtuse angle, and a plurality of through holes are provided in the bottom portion with respect to the wall plate forming the bottom portion. Both of the wall plates that stand up and form the edges of the opening are the side walls, and through holes are formed in both of the side walls.

The formwork used for constructing the work space for the wall balustrade buried pipeline according to the present invention is provided with a ceiling portion facing the bottom portion and parallel to the bottom portion and a reinforcing bar extending outward on the bottom portion. You may.

The bottom portion and the side wall portion, and the ceiling portion facing the bottom portion and parallel to the bottom portion and the side wall portion may be connected via a curved surface.

According to the structure of the work space for the wall balustrade buried pipeline according to the present invention, the back surface facing the opening and the bottom surface forming the lower edge in the height direction of the opening are opposed to both the bottom surface and the back surface. Since it intersects at an obtuse angle and is connected by a connecting surface inclined in the horizontal direction, it can be constructed so as to be inclined along the shape of the ground covering portion in the wall balustrade without interfering with the reinforcing bars forming the bar arrangement of the wall balustrade. Therefore, it is possible to reduce the number of cuts of the reinforcing bars constituting the bar arrangement of the wall balustrade, and to provide a work space in the middle of the wall balustrade buried pipeline without impairing the guard fence function of the wall balustrade.

Further, in the structure of the work space for the wall formwork buried pipeline according to the present invention, the bottom surface of the work space, the two side surfaces standing up against the bottom surface to form the edge of the opening, and the edge of the opening parallel to the bottom surface are formed. If the reinforcing bars extending upward and downward from the formwork members constituting the ceiling surface are embedded in the wall balustrade, the function of the wall balustrade as a protective fence can be further enhanced. can.

When a vehicle collides with a wall rail, it is considered that the collision position is mostly near the upper top of the wall rail. That is, it is considered that a collision load acts on the side surface of the roadway at the upper top of the wall balustrade, a tensile force is generated on the side surface of the roadway of the wall balustrade, and a compressive force is generated on the outer surface. Then, in such a situation, the formwork member integrated with the reinforcing material extending upward and downward of the wall railing function functions as a member that resists the tensile force generated on the side surface of the roadway. Therefore, the function as a guard rail for the wall balustrade is enhanced.

According to the method for constructing a work space for a wall formwork buried pipeline according to the present invention, one of the wall plates having a square opening and forming the edge of the opening is set as the bottom, and the back wall portion facing the opening is used. By using a formwork in which the bottom and the bottom are connected by a connecting wall that intersects both the back wall and the bottom at an obtuse angle, the reinforcing bars of the wall are arranged so as to be inclined along the shape of the ground covering in the wall. The formwork can be arranged without interfering with the reinforcing bars forming the wall, and the number of cuts of the reinforcing bars constituting the reinforcing bars of the wall balustrade can be reduced when constructing the work space.

In addition, since the connecting wall is arranged so as to be inclined with respect to the horizontal direction, the concrete that forms the wall balustrade, which is poured into the back of the formwork, flows from the back of the back wall of the formwork to the bottom of the bottom. The concrete that constitutes the wall balustrade flows smoothly into the bottom of the formwork.

Furthermore, since the bottom of the formwork is provided with a plurality of through holes, the air on the lower side of the bottom of the formwork is pushed out through the through holes into the concrete that has flowed in, so that a gap is formed on the lower side of the bottom of the formwork. Can be prevented.

As described above, according to the method for constructing the work space for the wall balustrade buried pipeline according to the present invention, the number of cuts of the reinforcing bars constituting the bar arrangement of the wall balustrade is reduced, and the concrete forming the wall balustrade is the work space. Since it is smoothly poured around the concrete and no gap is formed around the work space, the work space can be provided in the middle of the wall balustrade buried pipeline without impairing the guard rail function of the wall balustrade.

Furthermore, in the structural method of the work space for the wall balustrade buried pipeline according to the present invention, the ceiling portion parallel to the bottom portion of the formwork and the reinforcing bar extending outward at the bottom portion are embedded in the wall balustrade. As a result, the formwork member integrated with the reinforcing material extending upward and downward of the wall railing has the tensile force generated on the side surface of the road when the vehicle collides with the wall railing, as described above. Functions as a member that resists. Therefore, the guard rail function of the wall balustrade can be further enhanced.

Furthermore, if the bottom and side walls of the formwork and the ceiling and side walls facing the bottom and parallel to the bottom are connected via a curved surface, the wall balustrade is poured around the formwork. It is possible to reduce the resistance of the concrete forming the formwork to the flow from the upper surface of the ceiling portion of the formwork to the lower surface of the bottom portion through the side surface of the side wall portion. Therefore, concrete can be smoothly poured to the side of the side wall portion of the formwork and the lower side of the bottom portion, the formation of voids around the work space can be prevented, and the strength of the wall balustrade can be maintained.

The formwork used for constructing the work space for the wall balustrade buried pipeline according to the present invention is suitable for the structural method of the work space for the wall balustrade buried pipeline according to the present invention.

It is a perspective view which shows the embodiment of the structure of the work space for the wall balustrade buried pipeline which concerns on this invention. It is sectional drawing which enlarges and shows the part near the opening along the line of sight of the arrow AA of FIG. An embodiment of a formwork used for a method of constructing a work space for a wall balustrade buried pipeline according to the present invention is shown, (a) is a left side view, (b) is a front view, (c) is a plan view, and (d). ) Is a bottom view. It is a drawing substitute photograph which shows an example of the reinforcement arrangement which constitutes a wall balustrade. It is a drawing substitute photograph showing an example of a state in which a formwork is supported and fixed by an outer frame for constructing a wall balustrade. Another embodiment of the formwork used for the method of constructing the work space for the wall balustrade buried pipeline according to the present invention is shown, (a) is a left side view, and (b) is a front view.

An embodiment of the structure of the work space for a wall balustrade buried pipeline according to the present invention will be described with reference to FIGS. 1 and 2. In addition, in FIG. 1, in order to facilitate the understanding of the structure, only a part of the reinforcing bars forming the reinforcing bars constituting the wall balustrade is shown.

The work space 1 for the wall balustrade buried pipeline (hereinafter referred to as "work space 1") is provided in the wall balustrade buried pipeline 3 extending in the length direction L of the wall balustrade 2 in the wall balustrade 2 of the bridge. It has a rectangular opening 10 that communicates and opens on the road side surface 21 of the wall railing 2. Although the opening 10 is rectangular in this embodiment, it may be square.

The back surface 11 facing the opening 10 of the work space 1 stands upright in the vertical direction, and the height dimension H of the opening 10 and the depth dimension D from the opening to the back surface 11 are the diameters of the wall balustrade buried pipeline 3. It is made larger than R.

Specifically, the diameter R of the wall balustrade buried pipeline 3 is 60 mm, while the height dimension H is 350 mm and the depth dimension D is 203 mm. The opening 10 of this embodiment is inclined with respect to the back surface 11, and the length from the back surface 11 to the opening 10 differs depending on the portion, from the intermediate point in the height direction of the opening 10. The length to the back surface is the depth dimension D, but the length of any part may be any length as long as it is necessary to secure the required work area, and the length of the shortest part is the depth dimension D. You may.

From the viewpoint of securing a work space and maintaining the strength of the wall height column 2, the depth dimension D is preferably in the range of 185 to 220 mm. On the other hand, it is not preferable that the height dimension H deviates from 350 mm.

The bottom surface 13 and the back surface 11 forming the lower edge in the height direction of the opening 10 intersect with both the bottom surface 13 and the back surface 11 at an obtuse angle and are connected by a connecting surface 12 inclined in the horizontal direction. .. The back surface 11 and the connecting surface 12 are arranged on the road side with respect to the reinforcing bars 22 which are inclined along the shape of the ground covering portion 23 in the wall balustrade 2 and are a part of the reinforcing bars constituting the wall balustrade 2. Has been done.

Next, an embodiment of the formwork used for the method of constructing the work space for the wall balustrade buried pipeline according to the present invention will be described with reference to FIG.

The formwork 4 has a rectangular opening 40. In this embodiment, the long side dimension L of the opening 40 is 702 mm and the short side dimension S is 452 mm, but it can be appropriately determined according to the application of the work space 1. For example, it may be determined by the bending radius of the cable, the thickness of the connecting conduit, and the number of threads.

One of the wall plates forming the long side of the edge of the opening 40 is the bottom portion 42 of the formwork 4. Further, the back wall portion 41 facing the opening 40 and the bottom portion 42 are connected by a connecting wall portion 43 that intersects both the back wall portion 41 and the bottom portion 42 at an obtuse angle.

In this embodiment, in a state where the back wall portion 41 is erected parallel to the vertical axis, the bottom portion 42 is inclined in a direction away from the opening 40 with respect to the horizontal direction with an upward gradient of 10%, and the back wall portion is formed. The intersection angle between the connection wall portion 43 and the connection wall portion 43 is 142.5 degrees, and the intersection angle between the connection wall portion 43 and the bottom portion 42 is 133.2 degrees.

The intersection angle between the back wall portion 41 and the connection wall portion 43, and the intersection angle between the connection wall portion 43 and the bottom portion 42 are the angle formed by the back surface 11 and the connection surface 12 of the formed work space 1 and the connection surface 12 . The angle formed by the bottom surface 13 and the bottom surface 13 may be within the above-mentioned preferable range, and can be appropriately determined according to the construction situation.

The inclination angle of the bottom portion 42 with respect to the horizontal direction in a state where the back wall portion 41 is erected parallel to the vertical axis can be appropriately determined according to the state in which the formwork 4 is installed. In the state where the formwork 4 is installed, if the bottom portion 42 inclines with an upward slope in a direction away from the opening 40 with respect to the horizontal direction, it is along the connection wall portion 43 from the back surface of the back wall portion 41. It is preferable that the concrete can be smoothly poured in the path leading to the lower side of the bottom portion 42.

The bottom portion 42 is provided with a plurality of through holes 45. In this embodiment, through holes 46 having a diameter of 4 mm are provided on the entire surface of the bottom portion 42 at equal intervals. In order to prevent the formation of voids on the lower side of the bottom portion 42, it is preferable to increase the number of through holes 46 as much as possible.

Both of the wall plates that stand up against the wall plate forming the bottom portion 42 and form the edges of the opening 40 are the side wall portions 44, 44 of the formwork 4, and both the side wall portions 44, 44 have through holes 47. It is provided. In this embodiment, three through holes having a diameter of 60 mm are provided side by side in the height direction. The through holes provided in these side wall portions 44 are for communicating the work space 1 with the wall balustrade buried pipeline 3 extending in the length direction of the wall balustrade 2, and are provided in the wall balustrade buried pipeline 3. Any material may be suitable, and the shape and number of the pipes can be appropriately determined according to the laying condition of the wall balustrade buried pipeline 3.

The formwork 4 is made of SS400 plate material. In addition, the surface is provided with hot-dip galvanized rust preventive (JIS H 8461 HDZ45). However, there are no restrictions on the material and rust preventive specifications of the form 4, and the optimum material and rust preventive specifications can be adopted according to the usage conditions.

Next, an embodiment of a method for constructing a work space for a wall balustrade buried pipeline according to the present invention will be described with reference to FIGS. 4 and 5. In the description of the present embodiment, the same reference numerals are used in substantially the same parts as those of the embodiments shown in FIGS. 1 to 3.

When constructing the work space 1, a space for arranging the formwork 4 is provided in the bar arrangement constituting the wall balustrade 2, and the formwork 4 is arranged in the space. An example of bar arrangement is shown in FIG. In the bar arrangement shown in FIG. 4, a space for arranging the formwork 4 is provided in the central portion. Then, the formwork 4 is arranged in this central space.

The reinforcement arrangement shown in FIG. 4 is for producing a test body having the same shape as the wall railing 2, not for constructing the wall railing 2 on the roadside, but constructing the wall railing 2 on the roadside. It has the same structure as the bar arrangement for doing.

When the formwork 4 is arranged in the bar arrangement, it is also connected to the wall balustrade buried pipe 3 via the through hole 47 provided in the side wall portion 44. Since the reinforcement arrangement shown in FIG. 4 is in the state before the wall balustrade buried pipe 3 is arranged, the wall balustrade buried pipe 3 is not shown in FIG.

The formwork 4 arranged in the bar arrangement is supported and fixed by an outer frame for constructing the wall balustrade 2. FIG. 5 shows an example of a state in which the formwork 4 is supported and fixed by the outer frame. In the state shown in FIG. 5, the space formed in the central portion is the internal space of the formwork 4.

In addition, although FIG. 5 shows a state in which the outer frame is arranged around the reinforcement arrangement shown in FIG. 4, it is constructed by the same procedure as in the case of constructing a wall railing on an actual road.

After arranging the outer frame of the reinforcement arrangement and completing the support and fixing of the formwork 4, the concrete forming the wall balustrade 2 is poured from the upper gap of the outer frame. At this time, since the connecting wall portion 43 of the formwork 4 is arranged so as to be inclined with respect to the horizontal direction, the back of the formwork 4 of the concrete forming the wall railing 2 is poured into the back surface of the formwork 4. The resistance to the flow from the back surface of the face wall portion 41 to the lower side of the bottom portion 42 is reduced, and the concrete flows smoothly to the lower side of the bottom portion 42 of the formwork 4.

By arranging the bottom portion 42 so as to incline in an upward gradient in a direction away from the opening 40 with respect to the horizontal direction, concrete is provided along the path from the back surface of the back wall portion 41 to the lower side of the bottom portion 42 along the connection wall portion 43. It can be poured more smoothly.

The concrete poured into the lower side of the bottom 42 of the form 4 pushes out the air at that location through the through hole 46 of the bottom 42, so that it is possible to prevent the formation of voids on the lower side of the bottom 42 of the form 4. ..

Further, the sinking work can be performed while checking the state of the concrete through the through hole 46 of the bottom portion 42.

Next, with reference to FIG. 6, another embodiment of the formwork used for the method of constructing the work space for the wall balustrade buried pipeline according to the present invention will be described. In FIG. 6, substantially the same parts as the form shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

The formwork 5 includes a bottom portion 42 and a reinforcing bar 51 extending outward from the ceiling portion 45 facing the bottom portion 42 and parallel to the bottom portion 42. The material of the reinforcing bar 51 is not limited, but it is preferable to use the same reinforcing bar as the reinforcing bar constituting the wall railing 2. Further, in this embodiment, five reinforcing bars 51 are provided on each of the bottom portion 42 and the ceiling portion 45, but the number of reinforcing bars 51 and the arrangement interval can be appropriately determined according to the installation situation. ..

This formwork 5 is integrated with the reinforcing bar 51 extending upward and downward of the wall railing 2 in a state of being embedded in the wall railing 2, and the tension generated on the side surface of the roadway when the vehicle collides with the wall railing 2. It functions as a member that resists force. Therefore, the guard rail function of the wall balustrade can be further enhanced.

The bottom portion 42 and the side wall portion 44 of the formwork 5, and the ceiling portion 45 and the side wall portion 44 are connected via a curved surface. The opening 40 has a chamfered rectangular square.

According to this shape, the resistance of the concrete forming the wall railing 2 to be poured around the formwork 5 from the upper surface of the ceiling portion 45 of the formwork 5 to the lower side of the bottom portion 42 through the side surface of the side wall portion 44. Can be reduced. Therefore, concrete can be smoothly poured into the side of the side wall portion 44 of the formwork 5 and the lower side of the bottom portion 42.

1 Work space for wall balustrade buried pipeline 2 Wall balustrade 3 Wall balustrade buried pipeline 4, 5 Formwork 10, 40 Opening 11 Back surface
12 Connection surface
13 Bottom
21 Road side surface 22 Reinforcing bar 22a Upper end 22b Lower end 23 Ground covering 41 Back wall 42 Bottom 43 Connection wall 44 Side wall 45 Ceiling 46, 47 Through hole 51 Reinforcing bar

Claims (2)

It has a square opening that communicates with the wall balustrade buried pipeline extending in the length direction of the wall balustrade in the wall balustrade of the bridge and opens on the road side surface of the wall balustrade, and faces the opening. The back surface is upright in the vertical direction, and the height dimension of the opening and the depth dimension from the opening to the back surface are larger than the diameter of the wall railing buried pipeline, and are in the height direction of the opening. The bottom surface forming the lower edge and the back surface are connected by a connecting surface that intersects both the bottom surface and the back surface at an blunt angle and is inclined in the horizontal direction.
The back surface and the connecting surface are arranged so as to be inclined along the shape of the ground covering portion in the wall balustrade, and are arranged on the road side with respect to the reinforcing bars forming the reinforcing bars of the wall balustrade.
Above the wall balustrade and from the formwork members constituting the bottom surface, the two side surfaces that stand up against the bottom surface and form the edge of the opening, and the ceiling surface that is parallel to the bottom surface and forms the edge of the opening. A structure of a work space for a wall balustrade buried pipeline , which extends downward and is provided with reinforcing bars embedded in the wall balustrade. One of the wall plates having a quadrangular opening and forming an edge of the opening is a bottom portion, and the back wall portion facing the opening and the bottom portion have an obtuse angle with respect to both the back surface wall portion and the bottom portion. It is connected by a connection wall portion intersecting with each other, and a plurality of through holes are provided in the bottom portion, and both of the wall plates standing up against the wall plate forming the bottom portion and forming the edge of the opening are used as side wall portions. A formwork having through holes formed in both of the side wall portions is arranged so that the bottom portion is on the lower side and the connection wall portion is inclined with respect to the horizontal direction.
A wall balustrade buried pipeline extending in the length direction of the wall balustrade is connected to the through hole of the side wall portion in the wall balustrade of the bridge.
The back wall portion and the connecting wall portion are arranged so as to be inclined along the shape of the ground covering portion of the wall balustrade, and are arranged on the road side with respect to the reinforcing bars forming the reinforcing bars of the wall balustrade.
Concrete forming the wall balustrade is cast on the back surface of the formwork.
The formwork is characterized in that a ceiling portion facing the bottom portion and parallel to the bottom portion and a reinforcing bar extending outward are provided on the bottom portion, and the reinforcing bar is embedded in the wall balustrade. How to build a work space for a formwork buried pipeline.

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